无机电解质对十二烷基硫酸钠性质影响的研究

Study on Electrolyte Effect to Nature of Sodium Dodecyl Sulphate

选择不同类型的无机电解质(NaCl、Na2SO4、Na3PO4、MgCl2、AlCl3),考察了电解质对十二烷基硫酸钠(SDS)表面张力、临界胶束浓度、润湿力、发泡力、乳化力的影响规律。实验表明,无机电解质对SDS的CMC影响显著,随着无机盐的加入,CMC降低,表面活性增强。当加入的氯化钠浓度达到0.3mol/L时,SDS的CMC降到了原来的十分之一,高价位离子对CMC影响大于低价位离子,同价位不同离子影响差别不大;SDS润湿性、乳化性、泡沫性能较好,加入电解质后,其润湿性增强,乳化性、泡沫高度和稳泡性降低。

Choosing different types of inorganic electrolytes（NaCl,Na2SO4,Na3PO4,MgCl2,AlCl3）,electrolyte on the surface tension of sodium dodecyl sulfate,critical micelle concentration,wetting,foaming power,emulsifying power were studied.The result showed that inorganic electrolytes significantly affected the CMC SDS,with the addition of inorganic salt,cmc decreased,surfactant enhanced.When adding the sodium chloride concentration of 0.3mol/L,cmc of SDS fell to one-tenth.The effect of high electrovalencyions to CMC was higher than low electrovalencyions,and the litter difference between the effect of different ions with same electrovalency.SDS wetting,emulsification,foaming better,adding electrolyte,its enhanced wetting,emulsifying,foam heights and foam stability decreased.